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| Adams | ADA |
| Alamosa | ALA |
| Arapahoe | ARA |
| Archuleta | ARC |
| Baca | BAC |
| Bent | BEN |
| Boulder | BOU |
| Broomfield | BRO |
| Chaffee | CHA |
| Cheyenne | CHE |
| Clear Creek | CLC |
| Conejos | CON |
| Costilla | COS |
| Crowley | CRO |
| Custer | CUS |
| Delta | DEL |
| Denver | DEN |
| Dolores | DOL |
| Douglas | DOU |
| Eagle | EAG |
| El Paso | ELP |
| Elbert | ELB |
| Fremont | FRE |
| Garfield | GAR |
| Gilpin | GIL |
| Grand | GRA |
| Gunnison | GUN |
| Hinsdale | HIN |
| Huerfano | HUE |
| Jackson | JAC |
| Jefferson | JEF |
| Kiowa | KIO |
| Kit Carson | KIC |
| Lake | LAK |
| La Plata | LAP |
| Larimer | LAR |
| Las Animas | LAA |
| Lincoln | LIN |
| Logan | LOG |
| Mesa | MES |
| Mineral | MIN |
| Moffat | MOF |
| Montezuma | MON |
| Montrose | MOT |
| Morgan | MOR |
| Otero | OTE |
| Ouray | OUR |
| Park | PAR |
| Phillips | PHI |
| Pitkin | PIT |
| Prowers | PRO |
| Pueblo | PUE |
| Rio Blanco | RIB |
| Rio Grande | RIG |
| Routt | ROU |
| Saguache | SAG |
| San Juan | SAJ |
| San Miguel | SAM |
| Sedgwick | SED |
| Summit | SUM |
| Teller | TEL |
| Washington | WAS |
| Weld | WEL |
| Yuma | YUM |